If you’re prone to insomnia when it’s chilly outside, the problem may have to do with too little exposure to daylight in the colder months of the year. Working in well-lit conditions and using a light box may help to relieve your insomnia symptoms.
Sometimes I hear from people whose sleep problem sounds more like a circadian rhythm disorder than insomnia. Laurel wrote that she’d always been a night owl. So she was taking sleeping pills to get to sleep at night.
But if her problem is due to a delayed or sluggish body clock—if what she has is delayed sleep phase disorder (DSPD)—she’d be better off with other types of treatment. Here’s more:
If there’s a seasonal pattern to your insomnia, reduced light exposure could be the culprit. People in northerly latitudes are exposed to little daylight in the winter, and this can have a negative effect on circadian rhythms and worsen sleep.